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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c464de989099e1b488adedcde47f60a1f33c55bfc040cb44542285be403c15ec' 
  AND token = 'rZ+2dEJ5mXZz8yYfa1LASvrUcpe/juZXIraSL53SPa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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