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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c8200f878c3f2fff215e4f986e0bda084cd7d1658b51df2ad4a65637430c6a9' 
  AND token = 'QSxiFnNGMFfZJVKuCjCnQlvM2szcdhr2CzQtieM6S8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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