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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7820d93eaeafdd452f3c4bbdaee17fda16c92adecfc8a368952d0d4cb29da55a' 
  AND token = '8dlYi5Qwmw0dfW8N6VrSU3sDqcCFnYK1yoXMeifPJS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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