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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e29bfe56429e13e10196e10f85ac774cc83d2ffa9d95b3935d52132bdae5c1d' 
  AND token = 'Xw9Wq2d9AkA2qR0QqIg/a44JKJC8fOHXaxs/a5MAy4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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