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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc96e8a0f0cc4892aee86f1ac2bdc2b41c95316e4f756c4ed61b8edb0ad90e4' 
  AND token = 'TV8a6dWXN+4OY7aXK6qPCAGFXF+l397jW8qLocLyR8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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