SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6835b5838aa8811d04ba933f4751813f898cf062712d85ac685223e53022fc' 
  AND token = 'VzAFKEwZXXNoLcChPwvCkA1xwPSBWDYpLPNKaHLrdQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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