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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e88cbf047436d15be23c036e07ca5ff6962d9af8e9c1c63a992eccd415aa9ca' 
  AND token = 'QmZK8QJH28KtWy6T3Ib1xLKttuWNGtB8+8a87wemPp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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