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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a9446d92ec3b2b75ffd8196fc5b9a93900cc5bdfe10d23ad7b639793b9e56d2' 
  AND token = '0/AQng33tnvcE+XOndb/q4QEMXW/trw9jfxSZi9FqOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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