SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a1c79a334e532dd28a36f827802e333e8265785f4bff01cddfbfddc2415cfd' 
  AND token = 'EBr1W9HgnlPeOywCD+qqkMZWJ4zhrfK5wGpXKgLe6As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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