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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53252c3dc6667978c15e03e7e1447c42abdb5577e8567db5ba312e655ca651b6' 
  AND token = 'HZnuvVMpk8q7n1oEf8ZkxEFbA/bp4TzewDBQg0tfnqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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