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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5170830dc9934ce12b85cfc6381e9a83544a3717c57501c6995a61b22ec45459' 
  AND token = 's2eWSvgR9lFABH7/Jx5HdYFB5x1IqAUp441Ox2k3iDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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