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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394ba671704def55f43f3967117f0ba51d67a1e8edb71bf91bba0a76a534cb82' 
  AND token = 'YB3LrL45Rd3h+xinCw59Kj+mive4nw+P7inqXPoQLfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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