SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f30fa2af2466eb6a1a74e8e300cf39c81318a30d815bacb5e0c22ddebf1724b' 
  AND token = 'etyBA1Ao8GI4n3HyEOoHZ7V619pg4+IwV8nqxKOhSas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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