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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a8ad981dab71fb3da837a939b564a5cebb2c104690f43dc1b03bc9cdf6c4f1' 
  AND token = 'drjYgM7HFrkT8CAmHQTJO7NE8JdSv4HWb1VGlMsaRhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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