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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94d2b71eda17adef6fe3dc38ce28e774b2d9dfc9a68b600aa5c0b70620ef5ef' 
  AND token = 'SpiS09tKuWv0qhos3MHm7zltC+Yr99uyjqSrK4xvy7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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