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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45625bdbfeab107467a27b0552e7e4e1fcddd54f1b2ad7f6a4caa9621a16953b' 
  AND token = '6nBIt3M6xyd3mXH6nUnVsK0su8mxurpW09KY6gB7N7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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