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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206915b9c999a6f877b8210542e6cf73b83da8a57bc515a1eb395d5a9c96dd47' 
  AND token = 'DPbOYAz/8GE2HW/Eju0YyCEn0WYL1isxyIdEo8u7AGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}