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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b83c8ac0ab1a6ae90c6085e083815199676a192070b19ce72578967f6ecad3d' 
  AND token = 'N/zflggBt1u7Fkzq7j3IC4ElMXVdl1CMFc6Ykc26HJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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