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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5586f44651ca65f2120d8c2a792a64abaf1681f8822d648c27709b7f9683c078' 
  AND token = '2rPv/0OsC5i5mel9u7Cy0SYdnFJ0UdqVDbvTfb3RFxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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