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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c77cb6fb34d54b1719ee0530b3430b28b04f29ea6321d349c415c87f88626f79' 
  AND token = 'RI1NXH44nqz8nh4gI080zfQ4rxcrDN67NwUB6UJcKqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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