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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d5be9c4477d19b4b5f1a68f37e6413e74f6d969e90ca2316e67067dbe37dd0' 
  AND token = 'al5G4ym/dd+cpKiKX4/DdvY+WxZbE2uViqkaA5Zc9Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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