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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b71326b07fc12a12c25d7d6d5dcd6301147612b557e3871bcff079f283d344e' 
  AND token = '803mgk61LPq0+CRaXwFCmRN48lvqUvymUTtmd7ctjgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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