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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0a9729812f1e93a61feebf39e2bf01cccd9d7f3804a68833e1cb10d97d4ee0' 
  AND token = 'GlxxC71KL0rzCMbUgfOR/ctPkdX1o00Y3m8vdYpUUMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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