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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f1338d41b123083f0d32263d68786248b6dbffd23b5ad26375d1a834c97723' 
  AND token = '9G0gCfSn5tHh3TaWeJGgeAyKTqzO6irqA9ULlrFbLNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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