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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787300fddf37a6ec1914ff5d43ca1230392f94fb3c926113574e1d8b1ae7be49' 
  AND token = 'BiDG7fZpQuI4m3AYloffzqO20L/c7lFqj04ad/KY2EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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