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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daddc011ed8635f716bd22333b53db314c0809697eede538ab9858c85fc1e90c' 
  AND token = 'srPG7/NY7oGMxBlf2+6/OlaAqUlFfD6/GZJeJ3DFheA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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