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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f374d02beb46bc7fdd9689d08ff86e2c1d29f738675a036772ff5a8e49117e' 
  AND token = 'a3ejGApsZ6FXsYwE4BWOudzcRebuY6YavZFNEs/Ytkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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