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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08bbec0695bcc7a7bc7f5dd98e0db93ab96c05a456cc5d4f98a79e8accb8868' 
  AND token = 'gY/0AT3v9yB7WjTPnfXHJNHl6xuS2bHm2ddB4akmvog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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