SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed047a4f1f9003f01da43b013189e925361868200af36f0439478ed443bc4d2e' 
  AND token = '+yRKJQ9J9bpTjCT/zuEARD+LOXwCZuhotXSOq6+PrdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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