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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be732e329bb663fc3b8b4227c0d3795a4582a19afef2e0bb82262467a4bcc594' 
  AND token = 'K+Y9c09a/kZEYcdq3dTnChlZ6S0OlIw+ZdEMmONy26U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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