SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79110f7b337eaf422589f5a01be426d89e5cb6655ed3684b2eba9f879ab4d23e' 
  AND token = '7/2lSJlb+rAgRJfeaIjH7FfUqWx+vBE19ZKlHhpoZcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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