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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96d4062fd185bb0ab4064b0300b5b513057e069c1842000a9603f1e04cf6aab' 
  AND token = '8jKHOtbkZQqWNvRivBFE206ZllYi54pL/S+m5m6pf7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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