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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de82e1e766f6146280f761d85aa75fec9c76e79a48dac14ade466ac07fe3f5ff' 
  AND token = 'cX6vuheLzaTNmXOSZ7BzZHDRxGalMBBsAdk1B+eWD7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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