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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153ee21e4885210beffcd1f62a84b156f9cee926cdb411694f5e85a038a0990c' 
  AND token = '2yVgoFLXg5kpQ4s3P2A4s9qCzyYBz8KmF905pPJ8mH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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