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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3394524d764abb4096a6b322d64f2a02b5f5f5afef008f5dbf94183539de76' 
  AND token = 'ja4Vj8VT1aoYGAijqEpZVlOWNqSrBliUKGrt4XaE2GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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