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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a6411e0259a13924bcda313a05fa87d05df10b01eccd3cfaa1898dbe9d63b4' 
  AND token = 'jcRvKzS6ge7tvE5r+eChdrSXt6NpiibTEFxgNXfY4rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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