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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2507730e36ab1b29b6cad850444f814939921a2e3660372b20e186bfe4891c2f' 
  AND token = 'tHfD/86p6p5zieZQQZWdn5zrYu3RedMIaXoqyJozXOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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