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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c8ed1a47a77fe01b2eb655f2f6ae5bb6fbf5700a90d3930a72c84ceaacd961' 
  AND token = 'im5pIubdxNWbk8DVyp+q26QqKRNCrpptkwD4mRgDdxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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