SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69cf1188930de653fe7338b5942b5b12b9fe94b5376a118796e0717a3d2fc3eb' 
  AND token = 'Qf9h0PDzUnv6kuAC6vNEqBF9hWFJKnb/TSqVsapH8mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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