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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a4021666546426e57ae946ee6d771d6e70a482930292aaf18db506e1f6d82b' 
  AND token = 'aCA0dhlKRuNhdntZo+y0zonWLOysBUKtg65LpYwbKZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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