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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d7c32c510617828485c2aa28cfe78a387ab232424975c3d288f0fe6171ffd6' 
  AND token = '3Rq57f5HMTNS+jztLTBBUg5eauyjbWkhQ9f9Ud5Mwsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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