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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b121ef83f9e1ce5bc4a27d894f270be3a64d6cdc87a1ccf9e5093899bc2a32' 
  AND token = 'YHaQiN4Rbn7A2QuuVQ/82jm4szntgVguG9bLUg6Zib0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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