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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa0408e94a0f47f184717abd2a37a9adf114b78b9010a9102a5c44e8fd30267e' 
  AND token = '1Szyyo695QihokLZMZOkZCj2D6l+z4i6Plf6tyG45KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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