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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33654e9cbbfa0003c5012ee73928d547257c3465c8662e6a8bebb593cfe47913' 
  AND token = 'EjInOqxvTU9eiLQq7TIp7Pq2pyTPKVqlYffSWOH/Sos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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