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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4c305404201599a6f75618249846d0ecb938df20dcebc6dcc9db70217a157f' 
  AND token = '8hZ7AbkqYOi5+o4XnlG4K0C0MqeMbHu4LyhWF0OPgpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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