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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47aaa58323b41efb10cbfd1ed34837fa86a5de55e332954a4c12f59724c7fa9b' 
  AND token = 'leNuZG60TnhMjCVbazH0mOzCqmzOAYx+aGMokFssyag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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