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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3192dc8cdf964a5145ef8c19fbff3d3ff5bba7712a6111fb85632b66a8c1ff' 
  AND token = 'YcHcwzgZhaEh2+FCrX8rZXR0ZBtgkUq2HZe69R31YBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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