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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe29544e9d7290e62a45aee6f7b81aa20647aac10a3b2db539f6bbcfeda8b00a' 
  AND token = 'GTiWzs0glo7aVYd5oUHl4W896a/tw/u31xWjgtDTI6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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