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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3fdf8d692e41c1787dc7111e6e779485092d9636e9729027969785df92b3d2' 
  AND token = 'wDfGw5fiZxYqKSrYcfX96wVmLmWeW/jOycES3GJrmUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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