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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c47effe4351b780306fe31d79be0c71f0b4e670c769f78cd1f71b91d4427e7' 
  AND token = 'CF5j7qqL3bXFts/l41tthKzNd6TtE9KH/XOICQks4W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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