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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e995b15f8ee5ea493d6c0bb115c58b34010fd3bb59adcf405ba43ab71e989fdf' 
  AND token = 'D+BOdw5tiKayiSLchiPUYubkhIuI3lNgxpWPaN7k2sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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