SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642f9fcaf1c3a8d74d71f2ef52f6e69af9ec2cb7fe6bdea09d8be8bc561c2be9' 
  AND token = 'vVPgU8FfodhKoKutU/45Bn5XT+SzyMWklMP8s/z1BVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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