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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c97f8238a37e4111ce12f14b58f4cf3933264bd11a01f08d8cf68a3ccbcc6d6' 
  AND token = 'IVn4Xp7eWaQhjCsGKzUdoT+8d40R1lUpAwjfp6M2JGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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