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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '511b0959a5ca5049fbe20b8d38c341466117ef953d214e34e9b5bc65586b3a53' 
  AND token = '0lZk/u+DI4jx2mXSq3Ao5oEiqOY/nQ64vmlOipSNtkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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