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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a621f96336d3be9930ddee0a08f6a566022ca5e1f0ad3de227ac97ff4310cb0' 
  AND token = 'nRnz/NOBlWC1kVqpykN7t0Fra5sd9si7uliC7DzEdw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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