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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a03a3e867ce3e39804049bbc7ab2ada65772fc17698e321683f6a91d7a4e90' 
  AND token = 'y2cT/T2d0ySy05SAbAKcAerCiK3eG24zxhjY1OTeO40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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