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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d98e9f55a2a36f95147dc7245a1416286f52a8509fad79ac5a3921cf6fdc79' 
  AND token = 'CtR6IDazCDii2A9M2NyNAnSJogIwQw7y/kUbTwe7V10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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