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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027f6ffcc26d7c558edfb9214a8a01ac8c63a302c92c364cba01bf9945dc31ca' 
  AND token = 'mP/Iqoen7ut6L1NRngZaVmE9O9TZnMM/k8k13miC9do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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