SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda75864169f759931e30683a4658d2bf2aa2c7f73e51790529909dcbcb568fc' 
  AND token = '005ir8IcMmBDFvRbKdMqZHxY5rgSHhC2LY3CRWWQuz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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