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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4663b0343163171eee3851d5829c6a378a2c2c87e325286ebbd3f7369314a561' 
  AND token = 'xowNJVYSn1X/t1mOmZpXTJMqQsbUNA+Q9oD4IApuR1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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