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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d30c4dc8a0cae41cb022a0856a26d9261d54b09388a09e3550ef60fb35a3cc4' 
  AND token = 'Au+sEVV9L7LyFkTht6zswpxslpedtABCgjq7bNoe0Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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