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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a3bab66b89ff56aaa9e016a5a067c93c41a1a379e52d2d7ee226df07871df7' 
  AND token = 'Pz0XV/FNFdYzX101dWkeHq3cPq9Y1uuiEGVbdgPyjSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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