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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c185505a48899f43cd512c1c320c627b20654a4b65c90b40d0860680c1bfa0b1' 
  AND token = 'k65AsZ1EoXgD01G2elLxTgAJFpGVcLfT+vMUeGpjCKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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